Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.

Jan Engelhardt wrote:

On Dec 15 2007 17:46, Alan Cox wrote:

My understanding is that the linux starts in real mode, and uses theBIOS for such things as reading the very first image.
Not always. We may enter from 32bit in some cases, and we may also not
have a PC BIOS in the first place.


Computers without a PC BIOS (I'm trying to think of something, e.g.
the typical SUN sparc64 box) should have other means of accessing a
clocksource, no?


We were talking about x86 here, though.

Even on x86 we sometimes run from the 32-bit entrypoint.

	-hpa
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References:
- [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
  - From: "David P. Reed" <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
  - From: Ingo Molnar <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
  - From: "H. Peter Anvin" <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
  - From: Pavel Machek <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
  - From: "H. Peter Anvin" <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
  - From: Alan Cox <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
  - From: "David P. Reed" <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
  - From: "H. Peter Anvin" <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
  - From: "David P. Reed" <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
  - From: Alan Cox <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
  - From: Jan Engelhardt <[email protected]>

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